When a mineral crushing machine leaves the factory, it typically comes with a set of equipment parameters and an operation manual that specifies the types of lubricants to be used. There are numerous types of lubricants available, most of which share similar properties. Therefore, when selecting lubricants for specific components of mineral crushing equipment, it is generally necessary to consider factors such as the pressure, speed, temperature, condition of the components, and the structure of the lubrication system.

1. Current Status of Site Selection for Mineral Processing Equipment Factories

Issues related to site selection for mineral processing equipment factories:

1. Construction Halted Due to High Land Prices or Resident Protests: The selected site for a mineral processing equipment factory may be unable to proceed with construction due to exorbitant land prices or opposition from local residents.
2. Increased Transportation Costs and Improper Disposal of Construction Waste: An unscientific or unsuitable site selection for a mineral processing equipment factory can lead to soaring transportation costs for construction waste, resulting in indiscriminate dumping of waste without proper disposal facilities.
3. Distance from Consumption Centers or Building Material Markets: If the factory is located far from consumption centers for recycled products or building material markets, transportation costs and product sales issues can hinder the recycling of construction waste back into construction activities.
4. Safety Threats to Surrounding Communities: Improper site selection for mineral processing equipment factories can pose significant safety threats to the lives and property of nearby residents.

Cases of problems arising from unreasonable site selection for mineral processing equipment in China are not uncommon. The most severe example is the December 20th Shenzhen landslide incident, which not only caused massive casualties but also resulted in huge economic losses and incalculable social impacts. This tragic lesson must serve as a warning to prioritize the site selection of construction waste treatment plants.

2. Factors Influencing Site Selection for Mineral Processing Equipment

To reduce or avoid NIMBY (Not In My Backyard) conflicts, site selection for mineral processing equipment must take into account various factors, which can be broadly categorized into five main groups: social, economic, environmental, municipal, and legal factors.

2.1 Social Factors

Key considerations for site selection of mineral processing equipment include:

1. Noise Pollution
2. Residents' Perception of Risk: People have varying perceptions of risk associated with different facilities. The higher the perceived risk of a facility, the greater the resistance to it.
3. Information Asymmetry: Since construction waste treatment plants are considered NIMBY facilities, governments often do not disclose relevant information during the site selection process. Residents typically only learn of the specific location after it has been selected.
   • This can lead to situations where, despite obtaining necessary approvals and completing all relevant procedures, the adverse impacts of the treatment plant on the surrounding environment are overlooked. When the plant begins operation, its negative effects significantly disrupt the lives or work of nearby residents, leading to protests and complaints, and further negative consequences.
   • These factors can be collectively considered under "population density." Selecting a site with low population density reduces the number of residents affected by the mineral processing equipment, thereby lowering resistance to its location and facilitating government site selection efforts.

2.2 Economic Factors

1. Construction Costs:
   • Land acquisition costs for building the mineral processing equipment factory.
   • The scale of the factory directly affects construction costs. However, solely pursuing cost reduction by selecting the smallest possible scale may result in insufficient processing capacity to meet local demand. Therefore, choosing an appropriate scale is crucial.
2. Transportation Costs:
   • Costs associated with transporting construction waste from various construction sites to the treatment plant.
   • The distance from the treatment plant to building material markets directly affects the sales of recycled products. Road conditions also impact transportation costs.
3. Fixed Costs:
   • Expenses related to the purchase of mineral processing equipment and other necessary equipment.
4. Operating Costs:
   • Expenditures on employee salaries, management operations, equipment operation, and daily maintenance.
5. Compensation Costs:
   • The government should provide appropriate compensation for adverse impacts caused by the construction or operation of mineral processing equipment on surrounding residents, although this is often overlooked.

2.3 Environmental Factors

1. Climate Conditions:
   • Mineral processing equipment must be located downwind of the prevailing summer winds in the region and at least 500 meters away from the nearest residential area.
2. Water Body Protection:
   • The construction and operation of mineral processing equipment generate large amounts of harmful wastewater and liquids, necessitating a location far from water sources.
3. Terrain Slope:
   • Mineral processing equipment requires substantial space for stacking construction waste. A flat terrain facilitates stacking and transportation operations, while a slightly elevated terrain prevents water accumulation and aids drainage.
4. Geological Conditions:
   • The large volume and density of construction waste stacked at mineral processing equipment sites impose high demands on foundation bearing capacity. Sites must avoid muddy, soft, or sandy layers to ensure safety and durability.

2.4 Municipal Factors

Substantial investment is required for mineral processing equipment, and relatively complete municipal facilities can significantly reduce construction costs for treatment plants. These include:

• Power supply conditions
• Convenient information and communication
• Water supply and drainage facilities
• Land use planning
• Transportation conditions

2.5 Legal Factors

Site selection for mineral processing equipment must comply with relevant national laws and regulations on construction waste management.